Timeline Window ONLY OPEN on Documents that need it open

Say you are working on an animation in one document window but not in another. When you go into the other document window that you aren't working on animations, you'd think the Timeline window would not show up unless you tell it to for that particular document. I find it annoying when I go between documents that are using animations and ones that do not, I have to turn the Timeline window On and Off every time.

If any of you agree with me, let's try and fix this for the next release where Photoshop remembers what windows are open for specific documents.